Janus Henderson Mid Cap Value Portfolio Average Annual Total Returns - Service Shares [Member]	12 Months Ended	60 Months Ended	120 Months Ended
	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025
Russell 3000® Index (reflects no deduction for fees, expenses, or taxes)[Member]
Prospectus [Line Items]
Average Annual Return, Percent	17.15%	13.15%	14.29%
Russell Midcap® Value Index (reflects no deduction for fees, expenses, or taxes)[Member]
Prospectus [Line Items]
Average Annual Return, Percent	11.05%	9.83%	9.78%
Service Shares
Prospectus [Line Items]
Average Annual Return, Percent	6.29%	8.43%	8.40%